Nelson d



No. 770,408. PATENTED SEPT. 20, 1904.

' N. D. WELLS.

LOOK.

.APPLIOATION FILED APR. 6, 1904.

NO MODEL.

WITNESSES: INVENTOR flw fa /w vMMQMw 08 flaw/M2 1 Attorney PatentedSeptember 20, 1904.

PATENT OFFICE.

NELSON D. WELLS, OF DAYTON, OHIO.

LOCK.

SPECIFICATION forming part of Letters Patent No. 770,408, datedSeptember 20, 1904.

Application filed April 6, 1904. Serial No. 201,930. (No model.)

To a, whom it may concern.-

Beit known that I, N ELSON D. WELLS, acitizen of the United States,residing at Dayton, in the county of Montgomery and State of Ohio, haveinvented certain new and useful Improvements in Door-Locks; and I dohereby declare that the following is a full, clear, and exactdescription of the invention, which will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to the characters of reference markedthereon,which form a part of this specification.

Q My invention relates to improvements in door-locks and is that form oflocks designated mortise-locks.

The object of my invention is to provide a guard to prevent the slidingbolt being forced back by the entering of a plate or instrument betweenthe jamb and door by which to force gack the sliding bolt and therebyunlock the The device is adapted to the ordinary mortise-lock and doesnot require a material modification of the lock in its adaptation.

The mechanism is illustrated in the accompanying drawings, in whichFigure 1 is an elevation of the lock with the closing-plate of the caseremoved. Fig. 2 is a transverse section of Fig. 1 on line at, includinga portion of a door. Fig. 3 is a detailed elevation of the releasingdevices. Fig. 4 is a side view of the pawl.

The letters and numerals designate like parts throughout the severalviews.

The illustration Fig. 1 shows a well-known form of mortise-lock andincludes the device for securing the sliding bolt against an attempt toforce the same back by engaging the outer end of said bolt by aninstrument entered from without between the jamb and the door.

The case B comprises the face-plate, the lugs Z) 5 for the screws thathold the closing-plate O in position, the lug b as a bearing for theflat spring 8, which holds the pawl or dog 7 against the guard-plate D,the arresting-lug Z), and the pivotal lug 6 on which is held the arm 12,that operates the sliding bolt E (shown in Fig. 2) beneath saidguard-plate. The part 11 is pivoted, as usual, in the back and front ofthe case and the turning of which is by a spindle that occupies thesquare orifice of this part. The spindle is not shown, and knobs areattached to said spindle, the position of which is indicated by thecircular dotted line at 10, Fig. 1. The use of this part is to carry thesliding bolt back to release the door. The guard-plate D comprises thelip 1, to which is attached the spiral spring 5, the other end beingfastened to the face edge of the case, the use being to carry said plateoutwardly, the

square notch 2, and the downward extension 3, that engages the rearportion of the sliding bolt and arrests the outward movement of saidguard-plate.

In orifices in the sides of the case is pivoted the dog 7 which is madeto bear against the upper edge of the guard-plate D, and when this plateis thrown outward sufficiently it engages the shoulder 4 of said plate,which serves to hold said plate extended over the outer surface of thesliding bolt, the position being shown in Fig. 2. It is necessary toenlarge the orifice in the face of the case to receive this guard-plate,the other portion bearing against the closing-plate to maintain itsposition. This dog is provided with a square orifice to freely receivethe key 9, by which the same is operated and by which means the dog maybe raised from the shoulderof the guardplate, and the spiral spring willcarry said plate outwardly to its normal position. The catch 6 isprovided with the button 16 and is supported in a plate attached to thedoor and extends to the closin -plate, and there it is held by thespiral spring 15, and in this position it rests in the notch 2 of theguard-plate, which is thereby fixedly held. By taking hold of the buttonand pulling the catch is carried beneath the guard-plate, and the sameis free to move. The button 17 is held out of engagement by the spiralspring 14, supported in the case 13, attached to the door, and isarranged directly in line with the shaft of the former, and by pressureon this button the disengagement is effected, as above described. Theformer is operated from the inside and the latter from the outside, andthe effect of which is to release the sliding bolt from its lockedposition. When the guard-plate is engaged, such is the relation of theparts that this plate or the sliding bolt cannot be released until freedfrom the catch and dog that. the door may be opened, the final movementbeing by the knob.

Having described my invention, What I claim is 1. In a door-lock of themortise type the combination of the case provided with an enlargement ofthe orifice of the sliding bolt, the guard-plate to move freely Withinsaid orifice, the sliding bolt held in said orifice and beneath saidguard-plate, the dog, with its spring, adapted to engage the shoulder insaid guardplate to hold the same extended over the nose of said slidingbolt When in position for locking, the spiral spring to retain saidguardplate extended Without the case, and the key to operate said dog toeffect the release of said guard-plate and thereby relieve the slidingbolt, substantially as described.

2. In a door-lock of the mortise type the combination of the caseprovided With an enlargement of the orifice of the sliding bolt, theguard-plate to move freely Within said orifice, the sliding bolt held insaid orifice and beneath said guard-plate, the dog, With its spring,adapted to engage the shoulder in said guardplate and to hold the sameextended over the nose of said sliding bolt When in position forlocking, the spiral spring to retain said guardplate extended Withoutthe case, the catch to engage the square notch in said guard-plate tolock securely said guard-plate and the contacting sliding bolt, and thebutton to draw said catch out of said notch to effect the unlocking,substantially as described.

3. In a door-lock of the mortise type the combination of the caseprovided With an enlargement of the orifice of the sliding bolt, theguard-plate to move freely Within said orifice, the sliding bolt held insaid orifice and beneath said guard-plate, the dog With its springadapted to engage the shoulder in said guard-plate and to hold the sameextended over the nose of said sliding bolt when in position forlooking, the spiral spring to retain said guardplate extended Withoutthe case, the catch to engage the square notch in said guard-plate tolock securely said guard-plate and the contasting sliding bolt, and thebutton on the outside, by depression to effect the unlocking,substantially as described. 7

4:. In a door-lock of the mortise type the combination of the caseprovided With an enlargement of the orifice of the sliding bolt, theguard-plate to move freely Within said orifice, the sliding bolt held insaid orifice and beneath said guard-plate, the spiral spring to retainsaid guard-plate extended Without the case, the catch to engage thesquare notch in said guard-plate to lock the same and the sliding bolt,and the inner button to release said guard-plate, substantially asdescribed.

In testimony whereof I have signed my name to this specification in thepresence of tWo subscribing Witnesses.

NELSON D. WELLS. Witnesses:

ANNA B. ROBERTSON, S. RUFUs J ONES.

